Pipe-wrench



F. A. DEVEREAUX.

PIPE WRENCH.

APPLgcATloN FILED SEPT. x3. 1919.

1 $354,538, v .Patented Oct. 5, 1920.

UNITED STATES PATENT QFFICE.

FRANCIS A. DEVEREAX, OF ONE-FOURTH TO FRANK I-I. OF INTERNATIONAL FALLS,

NTERNATIONAL rants, MINNESOTA, .assIGNon or xnxns AND @NNE-arr frogarantiert KonNExn, BOTH MINNESOTA.

PIPEeWBENCH.

Application ined september 13, 191e.

To all w hom t may concern.'

Be it known that I, FRANCIS A. DnvnR- nAUx, a citizen of the UnitedStates, resid ing at International Falls, in the county of Koochichingand State of Minnesota, have invented certain new and useful Improvements in PipeVrenches; and I do hereby declare the following to bea full,

clear, and exact description ofthe invention, such as will enable othersskilled in the art to which it. appertains to make and use the same.

My invention has for its object to provide an improved internal pipewrench adapted to'work in the interior of a pipe, and to do this whenrotating in either direction. Generally stated, the invention consistsof the novel construction and combination of parts hereinafter describedand defined in the claims.

The improved wrench is illustrated in theA Fig. 2. but showing thewrench applied in- Side of the pipe or tube; and

Fig. 4 is a view correspoi'iding to Fig. 3, but showing the wrenchoperating in a reverse direction. i

In Figs. 3 and 4, the pipe is indicated by the numeral 5. The wrenchcomprises a handle 6 havinga laterally offset head 7. This head 7, nearits end, is formed with a large transverse notch 8 which leaves theextreme outer end ofthe head connected to the body thereof only by aneck portion 9, which is preferably made approximately V- shape in crosssection. At a point diametril cally opposite to the neck 9, a smallpivot or large pivot pin 10 is inserted through alined seats in theinner and outer portions of the head at a point eccentric to the axis ofsaid head. This pivot pin 10 is endwise removable but is normally heldin position by a ,screw 11 applied to the outer portion specification'of Letters raient.

Patented oet. 5, 1920.

Serial No. 323,481.

of the head and engageable with said pin. llvoted on the exposedintermediate portion of the pin 10 is a dog 12 provided with one or moresharp teeth at its free end. Preferably, said dog has one largeintermediate tooth 12a and on each side thereof, a Short tooth 12b. Thisdog will be normally pressed outward by one or the other of twooppositely acting torsion springs 13. These torsion springs are alike,except one is a right hand and the other a left hand spring. Each springis coiled about, or at least part way around the pin 10. Each spring hasan end 13n anchored in the outer portion of the head 7, and Va free endportion 13b that is engageable with the dog 12.

Of course, thisrwrench will act only upon pipes,` the interiors of whichare of slightly larger diameter than the exterior of the head 7, but thepipes may be considerably larger than the said head 7. Moreover, toextend the range of action of the wrench to p'pes that are of very muchgreater diameter than the said head .7,l I provide interchangeablyusable dogs 12 of different length.

In Fig. 2a, for example, there is shown a dog that is much longer thanthose of the other views, and which may be interchanged with the shortlugs, at will.

Fig. 3 illustrates the wrench applied to rotate the pipe in a clockwisedirection and Fig. 4 shows the wrench applied to rotate the pipe in ananti-clockwise direction. It will be noted that in both actions of thewrench, the dog is yieldingly pressed outward by one or the other of thesprings 13, so that its sharp edge will maintain engagement with thepipe when the wrench is given a backward rotation and will lQrip thepipe when rotating in a forward direction. Also, it is evident that thegreater the force applied to the lever 6 required to rotate the pipe,the greater will be the gripping action of the dog and wrench head onthe interior of the pipe.

This improved wrench may be made at reasonably small cost. is ofextremely simple construction and is highly efficient for the purposeshad in view.

at I claim is:

1. An internal pipe wrench comprising a head insertible into the pipe,the Said head having a notch and an eccentric pivot pin v'said vhead ineither direction. A,

1 3:1 An internal pipe Wrench comprising a 'one' side to the other of aline that inter-- sects .the axis of the head and pivot pin.

2. ,An internal pipe Wrench comprising ahead insertible into the pipe,the said head having a notch and an eccentric pivot pin extending intosaid notch, and a dog Vpivf oted on said pivotV pin for movement from'one side to the other of aline that intersects the axis ot' the head andpivot pin, the

said'dog being operative under rotation of head insertihle into thepipe, the said head having anotch and an eccentric pivot pin -fextendingintoy said notch, a dog pivotedl von said pivot pin Jfor movement fromone side to the other oia line thatrintersects the airis of the head andpivot/pin, and a spring anchored in respect to said head and operativeonsaiddog to yieldinglyhold the same infivorking position.

4. [in internalpipe Wrenchy comprising ay head insertible .into thepipe, the said head hav-ing a notch and a pivot pin extendingV Y.intolsaid notch,v a dog pivoted on said pivot pin, ,the said dog beingoperative under roe reversely acting-spring means anchored to -fsaidheadand operative onsaid dog to hold 4the lsameiny either of its. twoWorking positions.v L

l 5. An internal pipe Wrench comprising a iead insertihle into the pipe,the said head having a notch and a pivot pin extending into said notch,and a dog'rpivoted on said pivot pin, the said dog being operative underrotation of said head in either direction,

notch leaving the outerA portion ot the head connected with the body ofthe head only by a connecting neck at one yside of the head, a pivotpininsertible through seats *in said headatwa point diametrically opposite'said neck, al dog r1pivoted on said pin and ivork-iiigivithin saidnotch, and reversely acting spring prongs anchored to said head andlooped about `said pin With their ends projecting in opposite directionsJfor action Aon said :,iog, according to the direction in .Which'saiddog is `turned for action.

VVIn testimonyrwhereof-I aiiix my signature v in presence of twoWitnesses. tation-oi said ,head in either direction, :and

'FRANCIS a'nnviianaux.

Y Witnesses:

' CLARA DmviARns'i,l

. BERNICEVG. BAUMANN.V

